Postherpetic neuralgia(14) Pain(10) herpes zoster(7) Randomized controlled trial(5) paravertebral block(5) Acute herpes zoster(5) prevention(5) regional block.(5) cutaneous eruption(5) RCT(5) ITCH(3) stellate block(3) Post-herpetic neuralgia(3) Quality of life.(3) craniofacial pain(3) ultrasound-guided cervical nerve root block.(3) sympathetic block(3) acute zoster-associated pain(3) Trigeminal Neuralgia.(3) Quality of life(3) photophobia(3) methylcobalamin(3) herpes zoster burden of illness(3) Coronavirus disease 2019(2) randomized clinical trial(2) Steroids(2) postherpetic neuralgia.(2) prospective studies(2) subcutaneous injection.(2) Efficacy(2)